CN1028122C - Method and apparatus for casting piles in position - Google Patents

Abstract

A method and apparatus for piling a cast-in-place pile includes an earth auger main body and an auger head. The earth auger main body includes a hollow shaft, a spiral screw blade provided about the hollow shaft, a spiral belt provided on an outer circumference of the spiral screw blade and in parallel with an outer circumferential surface of the hollow shaft. The auger head is connected to a lower end of the earth auger main body and includes a hollow shaft, one or two spiral screw blades provided about the hollow shaft, one or two spiral belts provided on outer circumferences of the spiral screw blades and in parallel with the outer circumferential surface of the hollow shaft, and excavating bits provided at a lower end of the spiral screw blades, and device for preventing excavated earth and sand from flowing in a return direction when the auger head is rotated in a reverse direction.

Description

Method and apparatus for casting piles in position

The present invention relates to a kind of equipment that is widely used as the in-site pouring concrete pile of the ground in the construction work.

The method of now existing various castinplace piles, for example Benote piling method, oppositely drive piles method, auger piling method, dark basic piling method etc. the invention belongs to the scope of auger piling method.

In the auger piling method, excacation is directly undertaken by rotary well-bucket and is not prevented that the hole wall of controlling out is chipping.If the avalanche that requirement prevents to dig out hole wall then need be adopted slime water, as expansive soil suspension.

When excavating with rotary well-bucket, fill the sand that digs out when well-bucket after, just immediately well-bucket is pulled out the duct of being dug, outwell the sand in the bucket, and then well-bucket put into the duct.This operation will repeat repeatedly.Therefore, pour out sand in the well-bucket owing to will take time, so elongated the required time of borehole work.

Prevent under the cracked situation of hole wall as slime waters such as bentonite suspensions in use, produce so-called industrial waste,, will cause environment pollution if this refuse disposal is improper owing to the sand that digs out can mix mutually with bentonite suspension.

A kind of method of in situ pile is disclosed in " present situation of colonnade formula ground lower wall structure " literary composition of Japanese academic periodical " basic worker " (August nineteen eighty-two), this method comprise the steps: to make an auger on vertical direction rotary drilling ground to a desired depth, this auger comprises that a hollow shaft and one are perpendicular to the direction of the axle helical blade around hollow shaft; Rotate auger in opposite direction and auger is extracted together with the sand that digs out; Stiffener is inserted in the hole that scrapes out; And will grout in the hole that scrapes out by a tremie, it is progressively gathered together to the top, hole at the bottom of the hole.

The shortcoming of said method is: when rotating auger in opposite direction, the sand that digs out is tending towards refluxing and can not discharges the hole that has scraped out really.Like this, slime water such as bentonite suspension prevents under the cracked situation of hole wall when for example using, and is retained in sand in the hole and mixes with bentonite suspension and form industrial waste.If this industrial waste can not get suitable processing, will cause undesirable environment pollution.

The equipment that the purpose of this invention is to provide a kind of in situ pile eliminating the various shortcomings of prior art, and can significantly improve the operating efficiency of pouring concrete pile, and can not break the hole wall that is dug into pieces, also can not cause any environment pollution.

For achieving the above object, the equipment of of the present invention castinplace pile comprises: an auger main body and an augers.This auger main body has a hollow shaft, the helical blade around this hollow shaft, a hurricane band that centers on the helical blade neighboring and parallel with the external peripheral surface of hollow shaft; Above-mentioned augers is connected with the lower end of above-mentioned auger main body, and have a hollow shaft, one around the helical blade of this hollow shaft, be contained in the mining head of this helical blade lower end and be contained in arrestment mechanism near the helical blade lower end, it is used for preventing that the sand that digs out from reverse flow taking place when the augers reverse rotation.

As mentioned above, the used auger main body of the present invention comprise around the helical blade of hollow shaft with around helical blade neighboring and the hurricane band parallel with the external peripheral surface of hollow shaft.Therefore, the sand that digs out just is clamped in around the hollow shaft by helical blade and hurricane band.

In addition, according to the present invention, earlier with the auger desired depth of cutting the earth, this spiral is drilled with an auger main body that is connected with augers, this augers has an arrestment mechanism, in order to the sand that prevents to dig out reverse flow takes place when the augers reverse rotation; Then, in case after the auger reverse rotation, then by the present invention auger is pulled out, when the sand that digs out in the groove that is clamped in the whole length of auger in the spiral drilling was extracted outside the hole together, reverse flow can not take place in the sand that accumulates in the auger groove.

When extracting auger, bentonite suspension is poured in the hole of hollow shaft, so that replace the sand that digs out with Peng Run soil suspension.After stiffener is inserted the hole that scrapes out, just grout in the hole by the tremie handle, cement paste is gathered together to the top at the bottom of the hole.According to the present invention, dredge operation can proceed to the predetermined degree of depth continuously, and the sand that digs out then can be substituted out by bentonite suspension when extracting auger.If will pour into out the concrete pile that does not have stiffener, available water mud directly replaces out with the sand that digs out.

Therefore, according to the present invention, the castinplace pile operating efficiency has obtained improving significantly.In the process that auger is extracted, the hole wall that digs out can be not cracked, so, at the bottom of the hole that scrapes out, can not retain body refuse.

In addition, the sand that digs out is replaced by slime water (as bentonite suspension) under static state, and therefore, the sand that digs out can not mix with bentonite suspension, and the result just can not produce the industrial waste of environment pollution.According to the present invention, the sand that digs out can not with situation that bentonite suspension etc. mixes under outside the tap, therefore, the sand that digs out carrying and handling easily, and can recycling effectively.

In a most preferred embodiment of the present invention, arrestment mechanism comprises near the base plate and the brake of the hurricane band lower end (except the mining head) that is installed in augers, above-mentioned mining head can rotate with respect to base plate, to close and to open the opening of base plate, above-mentioned brake is connected with base plate rotationally, and shift onto with mining head by the sand that digs out and to contact, make it to be maintained in its closed position.

According to this device, augers also has hurricane band, so that the ability of the sand that the clamping of enhancing augers is dug out further reduces to dig out the defeated and dispersed of sand.

In another embodiment, brake is the arm shape, and its bottom is pivotally connected on the above-mentioned base plate, and its free end has stoping block, when the sand that digs out acts on above it, it is pushed away mining head.When the augers backward rotation, the free end of brake contacts with the projection of mining head, makes mining head remain on its fastening position.

The lower limb of hurricane band preferably is fixed on the helical blade of the helical blade of augers or auger main body, can prevent better that in this way the sand that digs out is defeated and dispersed.

In addition, helical blade can be to be centered around on the hollow shaft of augers bifilarly.

In yet another embodiment of the present invention, arrestment mechanism comprises near the base plate and the elastic panel of the lower end (except the mining head) of the hurricane band that is installed in augers.This mining head can rotate with respect to base plate, so that close and open the opening of base plate, this elastic panel is arranged in the base plate, and its edge is fixed on the base plate, and the lower end that is used for covering hurricane band is the zone that base plate cover does not live.

According to this set, elastic panel is bent upwards when excavating, so that have the sand that the mining head by augers digs out in one's care.And when extracting augers after excavation finishes, elastic panel is just got back to horizontal level, closes the opening of base plate automatically, thereby prevents the sloughing of sand that digs out in augers.

Correspondingly, adopt equipment of the present invention, can remove the sand of staying in the hole that scrapes out reliably.

By below in conjunction with the detailed description of accompanying drawing and listed claim, will understand the present invention more fully.In the accompanying drawing:

Fig. 1 is the full view of a kind of embodiment of expression present device.

Fig. 2 is the partial view of expression a kind of state when making equipment shown in Figure 1.

Fig. 3 is the flat sheet of the bottom view of auger shown in Figure 2.

Fig. 4 is the elevation of a kind of embodiment of expression augers of the present invention.

Fig. 5 is the flat sheet of the bottom view of augers shown in Figure 4.

Fig. 6 a～6f is the key diagram of illustrating each step of the inventive method.

Fig. 7 is the full view of second kind of embodiment of expression present device.

Fig. 8 a is the elevation of the augers of presentation graphs 7 apparatus shown lower ends use.

Fig. 8 b is the flat sheet of the bottom view of augers shown in Fig. 8 a.

Fig. 9 a is the part detail drawing of augers shown in Fig. 8 a.

Fig. 9 b is the flat sheet of the bottom view of augers shown in Fig. 9 a.

Figure 10 a is the partial view of the mining head state when work of augers shown in the presentation graphs 8a.

Figure 10 b is the flat sheet of the bottom view of mining head shown in Figure 10 a.

Figure 11 a is that the partial view of closing the mining head of base plate after the excacation is finished in expression.

Figure 11 b is the bottom plan view of mining head shown in Figure 11 a.

Figure 12 is the full view of the third embodiment of expression present device.

Figure 13 a is the elevation of the used augers of expression Figure 12 apparatus shown.

Figure 13 b is the flat sheet of the bottom view of augers shown in Figure 13 a.

Figure 14 a is the view that shows augers duty shown in Figure 13 a.

Figure 14 b is the flat sheet of the bottom view of augers shown in Figure 14 a.

Figure 15 a is the partial view of the hollow shaft lower end of expression augers.

Figure 15 b is the partial view of the augers that dissects along XVb-XVb line among Figure 15 a.

Fig. 1～5 expressions are according to auger of the present invention.

Comprise that according to auger of the present invention one has along the hollow shaft 1 of the slotted hole of extension of central axis, helical blade 2(Fig. 2) around hollow shaft 1, with one around and weldering dead on the neighboring of helical blade 2 and the hurricane band 3(that parallels with the external peripheral surface of hollow shaft 1 as shown in Figure 1), they have formed whole auger main body 4.Have connection in the top and bottom of hollow shaft 1 and insert axle 1b and branch sleeve 1c.

Shown in Fig. 1,3,4 and 5, helical blade 6 is centered around around the hollow shaft 5 of the porose 5a of its central axis tape.If necessary, the pitch of the helical blade 6 of hollow shaft 5 lower ends can be made littler, as shown in Figure 4, has mining head 7 and retaining board 8 in the lower end of helical blade 6, and they form the augers of an integral body.Retaining board 8 is positioned at the top of mining head 7, in order to the sand generation reverse flow that prevents to dig out.

Here said " oppositely " is meant that the sand that digs out is opposite with respect to the flow direction of the augers flow direction of sand when excavating.

Retaining board 8 is rotatably mounted on the bearing 10 on the helical blade 6 by a pin 11 for example as shown in Figure 4, and can be by swinging shown in the arrow A among the figure.When supposing augers 9 rotation retaining board 8 be in the double dot dash line 8 of Fig. 4 ' shown in the position, then when the augers reverse rotation, retaining board 8 will forward the position shown in the solid line among the figure to, to prevent to be clamped in the sand reverse flow between the helical blade 6.

The upper end of hollow shaft 5 has connect to insert an axle 5b, and it is inserted among the branch sleeve 1c shown in Figure 1, and by two bolts 12 both is coupled together, and like this, auger main body 4 and augers 9 just are connected together and form the auger 13 that in situ pile is used.

Illustrate the in situ pile method of using present device below in conjunction with accompanying drawing 6, as can be seen from Figure 6, this method is to use auger 13 of the present invention to realize.

Referring to Fig. 6 a, label 15 expression ground, be located in ground auger 16 and comprise crawler belt 17, be positioned at the post-tensioning dried 21 of rotary base 18, the support 19 on the crawler belt 17, the guide rod 20 that is erected at rotary base 18 front ends, guide rod 20 and the rotating driving device 23 of post-tensioning device 22 and twist bit.This device 23 can be suspended on guide rod 20 fronts with promoting.

According to the present invention, auger 13 be suspended on rotating driving device 23 below, it can raise and be positioned at the front of the guide rod 20 of auger 16, and above-mentioned auger 13 pierces ground (15) by the drive unit driven rotary, shown in Fig. 6 a.

Like this, the sand that is dug out by the mining head 7 in the lower end of the augers 9 of auger 13 bottoms by helical blade 6 rotations upwards and enter between the helical blade 2 of twist bit main body 4.

When carrying out this work, auger 13 pierces in the ground (15) gradually, makes the sand that is dug out be full of auger 13 and is in the blade 6 and 2 groove under the ground (15), shown in Fig. 6 a.

After, the borehole operation is proceeded, up to the position of auger 13 arrival desired depths, shown in Fig. 6 b.13 1 augers 13 are not enough to dig the required degree of depth if Fig. 6 b only shows an auger, can successively auger main body 4 be coupled together to proceed borehole work.

When the hole of being dug 25 arrives the predetermined degree of depth, auger 13 is at once to opposite spin (shown in Fig. 6 c), 8 of retaining boards from double dot dash line 8 ' the position forward the position (as mentioned above) of solid line 8 to, to prevent to be filled in sand 24 reverse flow in the helical blade 6.At this moment, then the sand 24 that is prevented to be filled in the helical blade 6 by hurricane band 3 spills out from auger main body 4, also can not flow out even extract ground at auger.

When extracting auger 13, pour into bentonite slurry or suspension 26 to the hole 25 of digging out by hole 1a on the hollow shaft 1 and 5 of auger 13 and 5a.Therefore, in the process that auger 13 upwards pulls out, the sand 24 that is dug out is just discharged from the hole, and simultaneously, bentonite suspension then is full of this hole and replaces sand 24.

After fully auger 13 being extracted the hole 25 of digging out after this manner, stiffener 27 inserted in the bentonite suspension 26 in the hole 25 of digging out (shown in Fig. 6 d) and arrange their in place.

Then, one tremie 28 is inserted in the hole 25 of digging out, again with cement paste by tremie 28, begin to be circulated into the hole 25 of digging out from the bottom in hole 25, above-mentioned cement paste is inserted in the hole 25 gradually to replace out bentonite suspension 26, shown in Fig. 6 e.

Fig. 6 f shows the complete concrete pile that in-site pouring as stated above comes out.

In addition, the present invention goes back available water replacement bentonite suspension 26.

Under certain conditions,, dig out the hole wall that comes and be difficult for broken or collapse, after having dug the hole, can save the operation of irritating bentonite slurry or water owing to run into underground lam or soft mud.

In addition, if will do not added the concrete pile of the in-site pouring of stiffener, when after having dug the hole, extracting auger 13, directly concrete grout is poured into the hole of being dug from the hole of hollow shaft.

As mentioned above, the used auger main body 4 of the present invention comprises hollow shaft 1, has a helical blade 2 around axle 1, around helical blade one hurricane band 3 that is parallel to the external peripheral surface of hollow shaft is arranged.Therefore, make the sand that digs out remain on can not flowing out of hollow shaft 1 on every side by helical blade 2 and hurricane band 3.

In addition, according to the present invention, have the augers 9 that is used for preventing digging out the retaining board 8 of sand 24 reverse flow of coming and be connected with the lower end of auger main body 4 and constitute auger 13, and, digging ground 15 to desired depth, auger by opposite spin, is extracted from the hole at once then.Therefore, can reverse flow take place by the sand 24 that retaining board 8 prevents to accumulate in the groove of auger 13, and auger 13 can be extracted from the hole by the sand that comes that digs out in the groove in being clamped in auger 13 whole length.

When extracting native twist bit, hole 1a and 5a by hollow shaft 1 and 5 pour into bentonite slurry 26 in the hole 25 of digging out, so that replace digging out the sand that comes with bentonite suspension.Then stiffener is inserted in the hole, by tremie concrete grout 29 is poured in the hole again, make cement paste from the bottom in hole productive set gradually, last, bentonite suspension 26 is replaced by cement paste 29 fully.Therefore, according to the present invention, but use auger 13 continuous effective ground borehole, and when extracting this auger 13, replaced the sand 24 that digs out in the hole 25 with bentonite suspension 26 again up to the predetermined degree of depth.In addition, if want in-site pouring to go out not have the concrete pile of stiffener, can directly eject the sand that digs out with concrete grout 29.

As mentioned above,, use auger 13, can carry out borehole continuously according to the present invention.Test verifiedly, its operating efficiency is two ones of augering of the prior art.

From above-mentioned explanation as can be seen, operating efficiency of the present invention increases significantly, and when auger was extracted, the hole wall that is dug was difficult for avalanche, did not almost have silt particle to stay at the bottom of the hole of being dug.Therefore, the present invention has great benefit, but in-site pouring goes out high-quality stake.

In addition, according to the present invention, replace by slime water (for example bentonite suspension) under static state owing to dig out the sand that comes, therefore, dig out the sand that comes and can not mix each other, so can not produce owing to both mix the industrial waste that forms contaminated environment with bentonite suspension.According to the present invention, digging out the sand that comes is to discharge from the hole separately, can not mix mutually with bentonite suspension, therefore, dig out the sand that comes and dispose easily, and can recycle effectively, so from avoiding public hazards aspect and from the economic point of view, the present invention has excellent effect.

Fig. 7 shows another embodiment of equipment of the present invention or auger.Auger main body shown in the figure and shown in Figure 1 basic identical is so no longer be described further.

Shown in Fig. 7 to Figure 11 a and Figure 11 b, augers 9 has a hollow shaft 5, this hollow shaft has a centre bore 5a, the helical blade 6 that around axle 5, has bifilar winding, the screw rod of two screw threads of picture, hurricane band 30 is centered around the neighboring of helical blade 6, and parallel with the external peripheral surface of hollow shaft 5.Two mining heads 31 are contained in rotationally the lower end of helical blade 6 respectively by the axle 32 that extends at the bottom level of augers.

On plan view, two mining heads 31 are all rectangular, and the one sideband has a plurality of breach 31a, form a part that is roughly comb shape.The carriage 33 that is fixed on the augers main body is installed in the breach 31a, and axle 32 is inserted the standing part of carriage 33 so that support mining head 31 rotationally.Carriage 34 is positioned at the central authorities of augers bottom, and between two mining heads 31 (Figure 10 b).

The leading edge 31b that it is wedge shape that each mining head 31 has a vertical cross-section and a step projection 31c in the rear end.

The base plate 35 of augers is fixed on the lower end (except that the standing part of mining head 31) of hollow shaft 5 and hurricane band 30, the mode of installing is, mining head 31 can be rotated, so that close and open augers with respect to base plate 35.The bottom of arm-type brake 36 is pivotally connected near the soffit of the base plate 35 mining head 31 trailing edges by axle 37.The free end of brake 36 has the stoping block 36b of downward extension.

Support member 38 is installed in the lower end of helical blade 6, so that support the projection 31c of mining head 31 when the auger rotation is excavated, mining head 31 is remained on excavate on the position.In addition, base plate 35 is equipped with brake block 39, and when the auger rotation was excavated, sand just affacted on the stoping block 36b, makes brake 36 around axle 37 rotations.When brake 36 rotated like this, brake block 39 was just supporting the free end 36b of brake 36, so that make the brake 36 and the projection 31c of mining head 31 keep certain distance.

More detailed situation can there is shown the mining head 31 when carrying out dredge operation referring to Figure 10 a and Figure 10 b.Augers is pressed the rotation of direction shown in the arrow B among Figure 10 b, makes projection 31c nestle up support member 38, to keep the leading edge 31b downward-sloping (shown in Figure 10 a) of mining head.At this moment, brake 36 leaves mining head 31, and contacts with brake block 39.

Referring again to Figure 11 a and 11b, the situation of the reverse rotation after finishing dredge operation of augers shown in the figure.Augers makes mining head 31 close (shown in Figure 11 a) with respect to base plate 35 along arrow C reverse rotation among Figure 11 b.Therefore, the projection 31c of mining head 31 has left support member 38, and the free end 36a of brake 36 then contacts with the upper surface of projection 31c, opens with respect to base plate 35 so that prevent mining head 31.

In other words, press among Figure 11 b direction shown in the arrow C when rotating when auger, brake 36 is just pressed the rotation of direction shown in the arrow D among Figure 11 b by means of stoping block 36b, so that the free end 36a of brake 36 is contacted with the upper surface of the projection 31c of mining head 31.

On the circumferential periphery of base plate 35, have one to have certain thickness columnar annular bottom plate 40, it is connected with hurricane band 30, and a upwardly extending semicircle breach 41 is arranged, and this breach radially faces toward the outer end of mining head.Side direction mining head 42 is contained in the semicircle breach 41, and is tilted to down extension (shown in Figure 10 a).

There is outlet 43(Fig. 9 b the lower end of hollow shaft 5), this outlet comprises fan-shaped rubber valve 44, this rubber valve is divided into 8 fan-shaped rubbers with a circular sheet rubber by its center and constitutes.One side of the fan-shaped rubber valve 44 of each piece is installed on the fixture of augers by banded pad 45 with two groups of screws 46, is used for ejecting the fluid from hollow shaft 5, as bentonite suspension.

Spiral shell shown in Fig. 8 a and the 8b is executed drill bit 9 and is also formed by top described mode.

Referring to Fig. 8 a, the upper end of hollow shaft 5 is equipped with one and is connected a slotting axle 5b again, and it inserts in the branch sleeve 1c (Fig. 7), and has two tired bolts 12 to insert therebetween, so that make auger main body 4 and augers 9 connect into the auger 13 that an in situ pile is used.

Adopt the in situ pile method of auger shown in Figure 7 13 just needn't put off until some time later according to the present invention and understand, because it is similar to the explanation of doing with reference to auger shown in Figure 6.

From above as seen, according to this embodiment, the hollow shaft 1 of auger main body 4 and augers 9 and 5 periphery have helical blade 2 and 6, and have the hurricane band 3 and 30 of the circumferential outer surface that is parallel to hollow shaft 1 and 5 in the neighboring of helical blade 2 and 6, therefore, the sand that digs out just by helical blade 2 and 6 and hurricane band 3 and 30 be clamped in hollow shaft 1 and 5 around.

Particularly, in this embodiment, augers 9 has hurricane band 30, and this has just increased the ability of the sand that the augers clamping digs out, and looses thereby further reduce the broken of sand that digs out.

And, owing to have hurricane band 3 and 30 on the helical blade 2 and 6, and the lower edge of hurricane band is (as Fig. 7 to Figure 11 a and Figure 11 b illustrated embodiment) that is fixed on the helical blade, has therefore further improved the broken ability of loosing of the sand that digs out that prevents.

In addition, in this embodiment, the hollow shaft 5 of two helical blades 6 around augers 9 arranged, and the neighboring of helical blade 6 has the hurricane band parallel with the external peripheral surface of hollow shaft 5 30.And two mining heads 31 are contained in the bottom of helical blade 6 respectively, and base plate 35 is contained near the end (removing the mining head 31) of helical blade.Mining head 31 can close and open with respect to base plate 35.When the auger backward rotation, the brake 36 that is rotatably connected to base plate 35 just rotates, so as with the back end in contact of mining head 31, mining head 31 is maintained in its closed position.Therefore, when extracting augers 9 after borehole is finished, the sand that digs out just is collected on the base plate 35, and simultaneously, the mining head 31 that is in deployed position during excavation just forwards the position of closing the base plate opening to.

Therefore, adopt augers 9 of the present invention, can remove reliably and remain in the sand that scrapes out in the hole.

As mentioned above, important meaning of the present invention is, compares with the method for prior art, uses equipment of the present invention can make easier, the faster and realization more accurately of in situ pile method.

Figure 12 shows another embodiment of equipment of the present invention or auger, wherein, represents with identical label with the part that second embodiment is similar.Auger main body shown in Figure 12 with shown in Figure 1 identical, has just no longer been described basically.

Shown in Figure 13 a to Figure 15 b, the auger bag of this embodiment is inserted mining head 31 and carriage 33 and 34 of helical blade 6, hurricane band 30, comb shape, and the part of second embodiment is similar shown in these parts and Fig. 7 to Figure 11 a and the 11b, has just no longer illustrated.

The base plate 35 of augers installs to the lower end (except that the standing part and the corresponding proparea of mining head 31 leading edge 31b, one side of mining head 31) (fan section have an appointment 90 ° angle, its center overlaps with the center of the hollow shaft of present embodiment) of hollow shaft 5 and hurricane band 30.Mining head 31 can be with respect to the plane of base plate 35 and is closed or open, shown in arrow E among Figure 14 a, and, mining head 31 is remained on excavate the position in order to rotate at auger, be fixed to the lower end of helical blade 6 with being used for the support member 56 of supporting lug 31c.

On the neighboring of base plate 35, have one to have certain thickness cylindrical shape annular bottom plate 37, it is connected with hurricane band 30.Side direction mining head 58 is contained in the lower end of hurricane band 30 and annulus base plate 57, and is tilted to down extension.

On plan view, the elastic panel 60(Figure 14 that bends to 1/4 circular arc a) makes with elastomeric material such as rubber, is used for covering the slit of base plate 35 or opening 59(Figure 15 a).One end 60a of these elastic panels 60 is fixed on base plate 35 edges by base 61, and relative with mining head 31, its free end 60b then is overlapped on the lower end of helical blade 6.

One end 60a of elastic panel 60 a) is fixed on the base 61 with grip block 62 and dog screw 63(Figure 14.

Shown in Figure 15 a and 15b, dividing plate 64 is installed in the position near hollow shaft 5 lower ends, it has two outlet opening or the outlet 64a that are 1/4 arcuation two radially relative positions, each outlet 64a has a fan-shaped rubber valve 65, this rubber valve 65 is to be divided into 8 fan-shaped rubbers with a circular sheet rubber by its center of circle to form, its side passes on the outlet limit that banded pad 66 is fixed on dividing plate 64 with two dog screws 67, above-mentioned outlet 64a is used for ejecting the fluid from hollow shaft 5, as bentonite suspension.

Augers 9 shown in Figure 13 a, 13b, 14a and the 14b constitutes according to mode recited above.

Auger main body 4 and augers 9 couple together and constitute an auger 13, are used for carrying out in situ pile according to second the same mode of embodiment.

If use above-mentioned auger 13 to excavate ducts, mining head 31 just excavates under the state shown in Figure 14 a, causes the free end 60b of elastic panel 60 to be bent upwards into the state shown in the double dot dash line of Figure 14 a.

Therefore, the sand that digs out just shifts out between elastic panel 60 and mining head 31, has in one's care in augers 9.

After excacation was finished, auger 13 stopped operating, and then auger 13 was extracted.As a result, elastic panel 60 is just got back on the horizontal level shown in Figure 14 a solid line by means of the elastic recovery effect of itself and the weight effect of the gathering sand that digs out in the above, thereby prevents that the sand that digs out from falling.

Adopt the auger 13 of above-mentioned the 3rd embodiment to carry out the method for in situ pile basically with identical, so just no longer made an explanation with reference to the method for figure 6a to 6f explanation.

According to the 3rd embodiment, the sand that digs out by helical blade 2 and 6 and hurricane band 3 and 30 be clamped in hollow shaft 1 and 5 around.Loose with the broken of sand that can further reduce to dig out by means of hurricane band 30 with second identical mode of embodiment.And, by as second embodiment, helical blade 2 and 6 being contained in the lower limb of hurricane band, can further prevent the defeated and dispersed of the sand that digs out.

In addition, according to the 3rd embodiment, in the lower end of hollow shaft 5 and hurricane band 30, except that the corresponding proparea of the standing part of mining head 31 and mining head 31 leading edge 31b one side, have base plate 35, an end 60a who covers the elastic panel 60 of slit or opening 59 is fixed to the inside of base plate 35.Therefore, during excavation, elastic panel 60 is bent upwards, so that the sand that mining head 31 is dug out is had the inside of augers 9 in one's care, but when after excavation finishes, extracting augers, elastic panel 60 just turns back to horizontal level, so that automatically close the outlet of base plate 35, prevents that the sand that digs out from falling.

Therefore, adopt above-mentioned augers 9, can remove reliably and remain in the sand that digs out in the hole.

As mentioned above, important meaning of the present invention is: compare with the method for prior art, use equipment of the present invention can make easier, the quicker and realization more accurately of in situ pile method.

Although set forth the present invention particularly with reference to most preferred embodiment above,, those skilled in the art person can understand that under the situation of the spirit and scope of the present invention, above-mentioned form of the present invention and details also can be made other change.

Claims (5)

1, a kind of equipment of in situ pile comprises an auger main body that has hollow shaft, and a helical blade is round this hollow shaft, and a hurricane band is arranged on round the helical blade neighboring, and parallels with the external peripheral surface of hollow shaft; An augers is connected with the lower end of above-mentioned auger main body, and have a hollow shaft, one mining head is contained in the lower end of helical blade, have the arrestment mechanism that is contained near the helical blade lower end and be used for preventing that the sand that digs out from reverse flow taking place when the spiral head reverse rotation, it is characterized in that described arrestment mechanism comprises the base plate of the lower end except that close mining head place of the hurricane band that is installed to augers, described mining head can rotate with respect to described base plate, described base plate has opening, can close or open the opening of this base plate by the rotation of mining head, also have brake to be pivotally connected on the above-mentioned base plate, it is pushed to mining head by the sand that digs out and contacts, and makes it to be maintained in its closed position.

According to the equipment of claim 1, it is characterized in that 2, above-mentioned mining head is the comb shape part that has some breach, the carriage that is fixed on augers is installed in this breach, and, in this carriage, insert an axle that supports mining head rotationally.

3, according to the equipment of claim 1, it is characterized in that, above-mentioned brake is the arm shape, its bottom is pivotally connected on the above-mentioned base plate, and its free end has stoping block, and the sand that digs out affacts on this stoping block, make brake leave mining head, when the augers reverse rotation, the above-mentioned free end of this brake contacts with the projection of mining head, and mining head is maintained in its closed position.

4, a kind of equipment of in situ pile comprises an auger main body that has hollow shaft, and a helical blade is round this hollow shaft, and a hurricane band is arranged on round the helical blade neighboring, and parallels with the external peripheral surface of hollow shaft; An augers is connected with the lower end of above-mentioned auger main body, and have a hollow shaft, one mining head is contained in the lower end of helical blade, be contained in addition reverse flow takes place when arrestment mechanism near the helical blade lower end is used for preventing the spiral head reverse rotation of the sand that digs out, it is characterized in that described arrestment mechanism comprises the base plate of the lower end except that close mining head place of the hurricane band that is installed to augers, described mining head can rotate with respect to described base plate, described base plate has opening, can close or open the opening of this base plate by the rotation of mining head, be installed to the elastic panel in the base plate in addition, the edge of elastic panel is fixed to and is used for covering above-mentioned hurricane band lower end on the base plate is the zone that above-mentioned base plate cover does not live.

5, according to the equipment of claim 4, it is characterized in that described base plate is installed in the lower end of hurricane band, but do not comprise following fan section, the angle in this fan section is that the center of the hollow shaft of 90 ° and its center and augers coincides, and above-mentioned elastic panel is the shape of 1/4 circular arc.

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